| DOI: | 10.1175/JCLI-D-15-0334.1
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| Scopus记录号: | 2-s2.0-84949943935
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| 论文题名: | Comparing trends in the southern annular mode and surface westerly jet |
| 作者: | Swart N.C.; Fyfe J.C.; Gillett N.; Marshall G.J.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2015
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| 卷: | 28, 期:22 | | 起始页码: | 8840
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| 结束页码: | 8859
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| 语种: | 英语
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| Scopus关键词: | Fighter aircraft
; Jets
; Annular mode
; Antarctic oscillation
; Geographic location
; Reanalysis
; Southern ocean
; Climate models
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| 英文摘要: | This paper examines trends in the southern annular mode (SAM) and the strength, position, and width of the Southern Hemisphere surface westerly wind jet in observations, reanalyses, and models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). First the period over 1951-2011 is considered, and it is shown that there are differences in the SAM and jet trends between the CMIP5 models, the Hadley Centre gridded SLP (HadSLP2r) dataset, and the Twentieth Century Reanalysis. The relationships between these trends demonstrate that the SAM index cannot be used to directly infer changes in any one kinematic property of the jet. The spatial structure of the observed trends in SLP and zonal winds is shown to be largest, but also most uncertain, in the southeastern Pacific. To constrain this uncertainty six reanalyses are included and compared with station-based observations of SLP. The CMIP5 mean SLP trends generally agree well with the direct observations, despite some climatological biases, while some reanalyses exhibit spuriously large SLP trends. Similarly, over the more reliable satellite era the spatial pattern of CMIP5 SLP trends is in excellent agreement with HadSLP2r, whereas several reanalyses are not. Then surface winds are compared with a satellite-based product, and it is shown that the CMIP5 mean trend is similar to observations in the core region of the westerlies, but that several reanalyses overestimate recent trends. The authors caution that studies examining the impact of wind changes on the Southern Ocean could be biased by these spuriously large trends in reanalysis products. © 2015 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50449
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada; British Antarctic Survey, Cambridge, United Kingdom
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| Recommended Citation: | |
Swart N.C.,Fyfe J.C.,Gillett N.,et al. Comparing trends in the southern annular mode and surface westerly jet[J]. Journal of Climate,2015-01-01,28(22)
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